Year	current US$
1970	750624.292148757
1971	861001.957743346
1972	1302142.57174179
1973	2751553.49394897
1974	2857401.43451339
1975	3460502.87644486
1976	3118004.54798862
1977	3494580.84118899
1978	3710565.59394087
1979	6848656.04834282
1980	9735426.20283306
1981	6414335.1342631
1982	8966859.29591312
1983	6864114.25374555
1984	4809755.62038508
1985	5477992.71388398
1986	6032446.42179789
1987	8819870.29178125
1988	8684294.08327553
1989	9065733.56974766
1990	8383465.52399484
1991	7357308.81244285
1992	7188072.42246214
1993	15680621.1777406
1994	15716284.2577575
1995	18019338.3009922
1996	19122338.6311428
1997	15715022.7975846
1998	14129546.444974
1999	8697045.50788417
2000	10131385.3032187
2001	10397692.5163249
2002	8670063.00136113
2003	13115734.771871
2004	9642708.12401977
2005	13528177.5423726
2006	14545962.8917346
2007	16736168.1422966
2008	21884870.5369846
2009	19464991.4532004
2010	34694293.1560424
2011	34549585.3531598
2012	35303141.0720761
2013	35204465.3435435
2014	38817144.4817818
2015	34082325.0938761
2016	32660295.9321879
2017	48975988.55278
2018	48418153.5020028
2019	46142082.9726203
2020	43512488.134721
2021	48409315.3962628